query_param: remove dead file

This file is empty and is not referenced anywhere. So just delete it.

Tested: code compiles.

Signed-off-by: Nan Zhou <nanzhoumails@gmail.com>
Change-Id: Ib2c743cf6ff06b8a68b7a887da5eee28a6d481f0
diff --git a/redfish-core/src/query_param.cpp b/redfish-core/src/query_param.cpp
deleted file mode 100644
index e69de29..0000000
--- a/redfish-core/src/query_param.cpp
+++ /dev/null